How do you tell your ex that you're still in love with him after you have left him for another man?

Depends what the underlying reason you left them was for. If they hurt you so much they pushed you away from them, then you shouldn't really go back to them. But if you really miss them then call them up, let them know that you made a mistake and you'd like to get together for a coffee or lunch. Don't spring it on him, just take it slow, friends is good at first and then just see what happens. good luck sweet x